The Under Current® is the worlds first re-circulating Water Culture Hydroponic System featuring our Patented Sub-Current Culture® Method. This innovative application circulates literally hundreds of gallons of solution per hour beneath plant roots. The Under Current® supercharges the solution with dissolved oxygen, creating a hyper aerobic condition. All Current Culture Systems now come with white ABS lids. These new white lids are made of durable ABS plastic, are UV stable, 100% non-translucent and highly reflective. New side-entry air ports on all Current Culture Under Current® system now include an innovative side-entry for the air diffuser lines utilizing a uni-seal for each module. This allows you to remove the entire module lid without disconnecting the air lines, making root-zone inspection much easier. Includes: 40 in center in the 13 gallon Blackout Series growth modules, 3 in manifold & joints, 3 in UC Spin-Tight Bulkheads, growth module lids, one 8 in net pot per growth module, Danner Mag-Drive Return Pump, Premium Linear Air Pump(s), 9 in air diffuser disc, Aqua-Pore Air Diffusers, air distribution manifold, air hose, in-line filter, adjustable float valve with reservoir adapter kit, drain valve, chiller adapter, garden hose drain adapter and Cultured Solutions VEG A/B. 4 site has a 10 ft x 12 ft grow area, 6 site has a 10 ft x 16 ft grow area, 8 site has a 10 ft x 20 ft grow area, 12 site has a 10 ft x 28 ft grow area and 16 site has a 10 ft x 34 ft grow area.